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Super Low Friction Characteristics Initiated by Running-in Process in Water-based Lubricant for Ti-Alloy |
ZHANG Huichen( ), QI Xuelian |
Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China |
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Cite this article:
ZHANG Huichen, QI Xuelian. Super Low Friction Characteristics Initiated by Running-in Process in Water-based Lubricant for Ti-Alloy. Chinese Journal of Materials Research, 2021, 35(5): 349-356.
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Abstract The influence of running-in process on friction characteristics of Ti-alloy by water-based lubrication process were investigated via CETR universal micro-tribometer (UMT-2) with Ti6Al4V disc and Si3N4 ball as tribo-pairs, konjac glucomannan (KGM) solutions as lubricant. The differences of the lubricating properties for Ti-alloy after dry friction and boric acid running-in process were analyzed. The results show that the wear area on the Si3N4 ball generated in the running-in process is the key factor that influenced the achieving of super-low friction. The super-low friction state (friction coefficient less than 0.01) could be acquired with KGM solution after both boric acid running-in and dry running-in. In the case of dry friction running-in, the super-low friction coefficient can be acquired only for the case with higher concentration KGM solutions and higher running speed, which mainly rely on the stronger hydrodynamic effect. In the case of boric acid running-in, the surface roughness of the tribo-pairs were greatly reduced, and the hydration layer of KGM was promoted by the chemical reactions between the boric acid and the KGM molecules. The super-low friction state could be achieved by the repulsive force between the hydrated KGM layers even for the solutions with low concentration of KGM.
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Received: 08 September 2020
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Fund: National Natural Science Foundation of China(51775077) |
About author: ZHANG Huichen, Tel: 15542672593, E-mail: hczhang@dlmu.edu.cn
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